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author | Deepthi Dharwar <deepthi@linux.vnet.ibm.com> | 2011-10-28 10:50:42 (GMT) |
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committer | Len Brown <len.brown@intel.com> | 2011-11-07 02:13:58 (GMT) |
commit | 46bcfad7a819bd17ac4e831b04405152d59784ab (patch) | |
tree | 20041e788154d103edff2699f88d4a30320e3ee2 /Documentation | |
parent | 4202735e8ab6ecfb0381631a0d0b58fefe0bd4e2 (diff) | |
download | linux-46bcfad7a819bd17ac4e831b04405152d59784ab.tar.xz |
cpuidle: Single/Global registration of idle states
This patch makes the cpuidle_states structure global (single copy)
instead of per-cpu. The statistics needed on per-cpu basis
by the governor are kept per-cpu. This simplifies the cpuidle
subsystem as state registration is done by single cpu only.
Having single copy of cpuidle_states saves memory. Rare case
of asymmetric C-states can be handled within the cpuidle driver
and architectures such as POWER do not have asymmetric C-states.
Having single/global registration of all the idle states,
dynamic C-state transitions on x86 are handled by
the boot cpu. Here, the boot cpu would disable all the devices,
re-populate the states and later enable all the devices,
irrespective of the cpu that would receive the notification first.
Reference:
https://lkml.org/lkml/2011/4/25/83
Signed-off-by: Deepthi Dharwar <deepthi@linux.vnet.ibm.com>
Signed-off-by: Trinabh Gupta <g.trinabh@gmail.com>
Tested-by: Jean Pihet <j-pihet@ti.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>
Acked-by: Arjan van de Ven <arjan@linux.intel.com>
Acked-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'Documentation')
0 files changed, 0 insertions, 0 deletions